#!/bin/sh
# libtool-reloc - libtool wrapper with support for relocatable programs
# Copyright (C) 2019-2020 Free Software Foundation, Inc.
# Written by Bruno Haible <bruno@clisp.org>, 2019.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

# Usage: libtool-reloc libtool LIBTOOL_ARGUMENTS

# Outputs a command and runs it.
func_verbose ()
{
  # Make it easy to copy&paste the printed command into a shell in most cases,
  # by escaping '\\', '"', and '$'. This is not perfect, just good enough.
  echo "$@" | sed -e 's/\([\\"$]\)/\\\1/g'
  "$@"
}

# Determine the mode from the arguments.
mode=
for arg
do
  case "$arg" in
    --mode=link) mode=link ;;
  esac
done

if test "$mode" = link; then
  # Determine the target from the arguments.
  target=
  next_is_target=false
  for arg
  do
    if $next_is_target; then
      target="$arg"
      next_is_target=false
    else
      case "$arg" in
        -o) next_is_target=true ;;
        *) next_is_target=false ;;
      esac
    fi
  done
  case "$target" in
    *.la)
      # When creating a library:
      # 1. Add a '-Wl,-rpath,@loader_path' option.
      #    (A '-R @loader_path' option does not work: libtool produces
      #    an error "error: only absolute run-paths are allowed".)
      #    (Also note that 'install_name_tool -add_rpath @loader_path ...'
      #    does not work on Mac OS X 10.5.)
      #    This is done through the RELOCATABLE_LDFLAGS macro.
      # 2. After creating the library, run
      #    install_name_tool -id @rpath/$dlname $target_dir/.libs/$dlname
      #    (This is easier than to modify the libtool script to emit a different
      #    install_name. Also, an option '-Wl,-install_name,@rpath/$dlname' does
      #    not work since libtool emits another option '-Wl,-install_name,...'
      #    after it.
      "$@" && {
        dlname_assignment=`grep '^dlname=' "$target"`
        dlname=
        eval "$dlname_assignment"
        # Nothing to do when --disable-shared was specified.
        if test -n "$dlname"; then
          target_dir=`dirname "$target"`
          if test -f "$target_dir/.libs/$dlname"; then
            func_verbose install_name_tool -id "@rpath/$dlname" "$target_dir/.libs/$dlname"
          fi
        fi
      }
      ;;
    *)
      "$@"
      ;;
  esac
else
  "$@"
fi
